// Parses a string that represents a set (i.e., "6-3") by breaking the
// string into two substrings and converting those strings to
// integers, which are returned via call-by-reference parameters
void parse_set(std::string &set, int &games_won, int &games_lost) {
  int i = set.find('-');
  games_won =  atoi(set.substr(0,i).c_str());
  games_lost = atoi(set.substr(i+1,set.size()-i-1).c_str());
}